The Earth's Seasons: A Necessity For Survival

"The earth has an axial tilt of about 23.5 degrees. While this tilt is responsible for shaping our planet's climate and seasons, it also played a crucial role in shaping life on earth. What would have happened if the earth had no tilt? Is it even normal for a planet to tilt? What caused it? 

"Most planets in our solar systems have a tilt. Mercury is the only one that has nearly no tilt at 2 degrees. It’s thought that early in earth’s formation over 4 billion years ago, a planet the size of Mars, which we now call Theia, crashed into earth and knocked it off its kilter. In doing so, some of the material from the two planets was thrown off and began to orbit the earth. And over time it coalesced into the moon. This impact also created a permanent tilt in earth’s rotation."

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Why Earth's Tilt is FAR More Important Than We Realize